Three 6-hydroxylated bile acids, 3α, 6α, 7α, 12α-, 3α, 6β, 7α, 12α- and 3α, 6β, 7β, 12α-tetrahydroxy-5β-cholan-24-oic acids, were synthesized from methyl cholate, and a sensitive method was developed for analyzing them by gas chromatography-mass spectrometry for the stoichiometric study of fetal bile acids. 3α, 6α, 7α, 12α-Tetrahydroxy-5β-cholan-24-oic acid (6α-hydroxylated cholic acid) was identified from human meconium and healthy neonatal urine by comparison with the mass spectrum of the reference compound. In human meconium, 6α-hydroxylated cholic and chenodeoxycholic acids were determined in 1.2% and 29.0% of the total bile acids, respectively. We discuss the significance of hydroxylation at the C-1β and C-6α positions of bile acids and their elimination in fetal and neonatal periods.
从
胆酸甲酯合成了三种 6-羟基化
胆汁酸,3α、6α、7α、12α-、3α、6β、7α、12α- 和 3α、6β、7β、12α-四羟基-5β-cholan-24-oic 酸,并开发了一种灵敏的方法,通过气相色谱-质谱法对其进行分析,以进行胎儿
胆汁酸的
化学计量研究。通过与参考化合物的质谱比较,从人胎便和健康新生儿尿液中鉴定出 3α、6α、7α、12α-四羟基-5β-胆烷-24-oic 酸(6α-羟基化
胆酸)。在人胎便中,6α-羟基化
胆酸和
鹅去氧胆酸分别占总
胆汁酸的 1.2% 和 29.0%。我们讨论
胆汁酸 C-1β 和 C-6α 位置羟基化的重要性及其在胎儿和新生儿时期的消除。